[PATCH v6 3/5] drm/bridge: anx7625: add MIPI DPI input feature support

Xin Ji
2021-03-19T06:35:01Z

Add MIPI rx DPI input support.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Xin Ji <xji@analogixsemi.com>
---
drivers/gpu/drm/bridge/analogix/anx7625.c | 245 ++++++++++++++++------
drivers/gpu/drm/bridge/analogix/anx7625.h | 18 +-
2 files changed, 203 insertions(+), 60 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 04536cc7afe7..8c514b46d361 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -150,18 +150,18 @@ static int anx7625_write_and(struct anx7625_data *ctx,
return anx7625_reg_write(ctx, client, offset, (val & (mask)));
}

-static int anx7625_write_and_or(struct anx7625_data *ctx,
- struct i2c_client *client,
- u8 offset, u8 and_mask, u8 or_mask)
+static int anx7625_config_bit_matrix(struct anx7625_data *ctx)
{
- int val;
+ int i, ret;

- val = anx7625_reg_read(ctx, client, offset);
- if (val < 0)
- return val;
+ ret = anx7625_write_or(ctx, ctx->i2c.tx_p2_client,
+ AUDIO_CONTROL_REGISTER, 0x80);
+ for (i = 0; i < 13; i++)
+ ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
+ VIDEO_BIT_MATRIX_12 + i,
+ 0x18 + i);

- return anx7625_reg_write(ctx, client,
- offset, (val & and_mask) | (or_mask));
+ return ret;
}

static int anx7625_read_ctrl_status_p0(struct anx7625_data *ctx)
@@ -219,38 +219,6 @@ static int anx7625_video_mute_control(struct anx7625_data *ctx,
return ret;
}

-static int anx7625_config_audio_input(struct anx7625_data *ctx)
-{
- struct device *dev = &ctx->client->dev;
- int ret;
-
- /* Channel num */
- ret = anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
- AUDIO_CHANNEL_STATUS_6, I2S_CH_2 << 5);
-
- /* FS */
- ret |= anx7625_write_and_or(ctx, ctx->i2c.tx_p2_client,
- AUDIO_CHANNEL_STATUS_4,
- 0xf0, AUDIO_FS_48K);
- /* Word length */
- ret |= anx7625_write_and_or(ctx, ctx->i2c.tx_p2_client,
- AUDIO_CHANNEL_STATUS_5,
- 0xf0, AUDIO_W_LEN_24_24MAX);
- /* I2S */
- ret |= anx7625_write_or(ctx, ctx->i2c.tx_p2_client,
- AUDIO_CHANNEL_STATUS_6, I2S_SLAVE_MODE);
- ret |= anx7625_write_and(ctx, ctx->i2c.tx_p2_client,
- AUDIO_CONTROL_REGISTER, ~TDM_TIMING_MODE);
- /* Audio change flag */
- ret |= anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
- AP_AV_STATUS, AP_AUDIO_CHG);
-
- if (ret < 0)
- DRM_DEV_ERROR(dev, "fail to config audio.\n");
-
- return ret;
-}
-
/* Reduction of fraction a/b */
static void anx7625_reduction_of_a_fraction(unsigned long *a, unsigned long *b)
{
@@ -410,7 +378,7 @@ static int anx7625_dsi_video_timing_config(struct anx7625_data *ctx)
ret |= anx7625_write_and(ctx, ctx->i2c.rx_p1_client,
MIPI_LANE_CTRL_0, 0xfc);
ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client,
- MIPI_LANE_CTRL_0, 3);
+ MIPI_LANE_CTRL_0, ctx->pdata.mipi_lanes - 1);

/* Htotal */
htotal = ctx->dt.hactive.min + ctx->dt.hfront_porch.min +
@@ -595,6 +563,76 @@ static int anx7625_dsi_config(struct anx7625_data *ctx)
return ret;
}

+static int anx7625_api_dpi_config(struct anx7625_data *ctx)
+{
+ struct device *dev = &ctx->client->dev;
+ u16 freq = ctx->dt.pixelclock.min / 1000;
+ int ret;
+
+ /* configure pixel clock */
+ ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ PIXEL_CLOCK_L, freq & 0xFF);
+ ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ PIXEL_CLOCK_H, (freq >> 8));
+
+ /* set DPI mode */
+ /* set to DPI PLL module sel */
+ ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
+ MIPI_DIGITAL_PLL_9, 0x20);
+ /* power down MIPI */
+ ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
+ MIPI_LANE_CTRL_10, 0x08);
+ /* enable DPI mode */
+ ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
+ MIPI_DIGITAL_PLL_18, 0x1C);
+ /* set first edge */
+ ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
+ VIDEO_CONTROL_0, 0x06);
+ if (ret < 0)
+ DRM_DEV_ERROR(dev, "IO error : dpi phy set failed.\n");
+
+ return ret;
+}
+
+static int anx7625_dpi_config(struct anx7625_data *ctx)
+{
+ struct device *dev = &ctx->client->dev;
+ int ret;
+
+ DRM_DEV_DEBUG_DRIVER(dev, "config dpi\n");
+
+ /* DSC disable */
+ ret = anx7625_write_and(ctx, ctx->i2c.rx_p0_client,
+ R_DSC_CTRL_0, ~DSC_EN);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "IO error : disable dsc failed.\n");
+ return ret;
+ }
+
+ ret = anx7625_config_bit_matrix(ctx);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "config bit matrix failed.\n");
+ return ret;
+ }
+
+ ret = anx7625_api_dpi_config(ctx);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "mipi phy(dpi) setup failed.\n");
+ return ret;
+ }
+
+ /* set MIPI RX EN */
+ ret = anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
+ AP_AV_STATUS, AP_MIPI_RX_EN);
+ /* clear mute flag */
+ ret |= anx7625_write_and(ctx, ctx->i2c.rx_p0_client,
+ AP_AV_STATUS, (u8)~AP_MIPI_MUTE);
+ if (ret < 0)
+ DRM_DEV_ERROR(dev, "IO error : enable mipi rx failed.\n");
+
+ return ret;
+}
+
static void anx7625_dp_start(struct anx7625_data *ctx)
{
int ret;
@@ -605,9 +643,10 @@ static void anx7625_dp_start(struct anx7625_data *ctx)
return;
}

- anx7625_config_audio_input(ctx);
-
- ret = anx7625_dsi_config(ctx);
+ if (ctx->pdata.is_dpi)
+ ret = anx7625_dpi_config(ctx);
+ else
+ ret = anx7625_dsi_config(ctx);

if (ret < 0)
DRM_DEV_ERROR(dev, "MIPI phy setup error.\n");
@@ -1051,6 +1090,7 @@ static void anx7625_start_dp_work(struct anx7625_data *ctx)
return;
}

+ ctx->hpd_status = 1;
ctx->hpd_high_cnt++;

/* Not support HDCP */
@@ -1060,8 +1100,10 @@ static void anx7625_start_dp_work(struct anx7625_data *ctx)
ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xec, 0x10);
/* Interrupt for DRM */
ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xff, 0x01);
- if (ret < 0)
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "fail to setting HDCP/auth\n");
return;
+ }

ret = anx7625_reg_read(ctx, ctx->i2c.rx_p1_client, 0x86);
if (ret < 0)
@@ -1080,6 +1122,10 @@ static void anx7625_hpd_polling(struct anx7625_data *ctx)
int ret, val;
struct device *dev = &ctx->client->dev;

+ /* Interrupt mode, no need poll HPD status, just return */
+ if (ctx->pdata.intp_irq)
+ return;
+
if (atomic_read(&ctx->power_status) != 1) {
DRM_DEV_DEBUG_DRIVER(dev, "No need to poling HPD status.\n");
return;
@@ -1130,6 +1176,21 @@ static void anx7625_remove_edid(struct anx7625_data *ctx)
ctx->slimport_edid_p.edid_block_num = -1;
}

+static void anx7625_dp_adjust_swing(struct anx7625_data *ctx)
+{
+ int i;
+
+ for (i = 0; i < ctx->pdata.dp_lane0_swing_reg_cnt; i++)
+ anx7625_reg_write(ctx, ctx->i2c.tx_p1_client,
+ DP_TX_LANE0_SWING_REG0 + i,
+ ctx->pdata.lane0_reg_data[i] & 0xFF);
+
+ for (i = 0; i < ctx->pdata.dp_lane1_swing_reg_cnt; i++)
+ anx7625_reg_write(ctx, ctx->i2c.tx_p1_client,
+ DP_TX_LANE1_SWING_REG0 + i,
+ ctx->pdata.lane1_reg_data[i] & 0xFF);
+}
+
static void dp_hpd_change_handler(struct anx7625_data *ctx, bool on)
{
struct device *dev = &ctx->client->dev;
@@ -1145,9 +1206,8 @@ static void dp_hpd_change_handler(struct anx7625_data *ctx, bool on)
} else {
DRM_DEV_DEBUG_DRIVER(dev, " HPD high\n");
anx7625_start_dp_work(ctx);
+ anx7625_dp_adjust_swing(ctx);
}
-
- ctx->hpd_status = 1;
}

static int anx7625_hpd_change_detect(struct anx7625_data *ctx)
@@ -1224,20 +1284,72 @@ static irqreturn_t anx7625_intr_hpd_isr(int irq, void *data)
return IRQ_HANDLED;
}

+static int anx7625_get_swing_setting(struct device *dev,
+ struct anx7625_platform_data *pdata)
+{
+ int num_regs;
+
+ if (of_get_property(dev->of_node,
+ "analogix,lane0-swing", &num_regs)) {
+ if (num_regs > DP_TX_SWING_REG_CNT)
+ num_regs = DP_TX_SWING_REG_CNT;
+
+ pdata->dp_lane0_swing_reg_cnt = num_regs;
+ of_property_read_u32_array(dev->of_node, "analogix,lane0-swing",
+ pdata->lane0_reg_data, num_regs);
+ }
+
+ if (of_get_property(dev->of_node,
+ "analogix,lane1-swing", &num_regs)) {
+ if (num_regs > DP_TX_SWING_REG_CNT)
+ num_regs = DP_TX_SWING_REG_CNT;
+
+ pdata->dp_lane1_swing_reg_cnt = num_regs;
+ of_property_read_u32_array(dev->of_node, "analogix,lane1-swing",
+ pdata->lane1_reg_data, num_regs);
+ }
+
+ return 0;
+}
+
static int anx7625_parse_dt(struct device *dev,
struct anx7625_platform_data *pdata)
{
- struct device_node *np = dev->of_node;
+ struct device_node *np = dev->of_node, *ep0;
struct drm_panel *panel;
int ret;
+ int bus_type, mipi_lanes;

+ anx7625_get_swing_setting(dev, pdata);
+
+ pdata->is_dpi = 1; /* default dpi mode */
pdata->mipi_host_node = of_graph_get_remote_node(np, 0, 0);
if (!pdata->mipi_host_node) {
DRM_DEV_ERROR(dev, "fail to get internal panel.\n");
return -ENODEV;
}

- DRM_DEV_DEBUG_DRIVER(dev, "found dsi host node.\n");
+ bus_type = 5;
+ mipi_lanes = MAX_LANES_SUPPORT;
+ ep0 = of_graph_get_endpoint_by_regs(np, 0, 0);
+ if (ep0) {
+ if (of_property_read_u32(ep0, "bus-type", &bus_type))
+ bus_type = 0;
+
+ mipi_lanes = of_property_count_u32_elems(ep0, "data-lanes");
+ }
+
+ if (bus_type == 5) /* bus type is Parallel(DSI) */
+ pdata->is_dpi = 0;
+
+ pdata->mipi_lanes = mipi_lanes;
+ if (pdata->mipi_lanes > MAX_LANES_SUPPORT || pdata->mipi_lanes <= 0)
+ pdata->mipi_lanes = MAX_LANES_SUPPORT;
+
+ if (pdata->is_dpi)
+ DRM_DEV_DEBUG_DRIVER(dev, "found MIPI DPI host node.\n");
+ else
+ DRM_DEV_DEBUG_DRIVER(dev, "found MIPI DSI host node.\n");

ret = drm_of_find_panel_or_bridge(np, 1, 0, &panel, NULL);
if (ret < 0) {
@@ -1300,9 +1412,13 @@ static enum drm_connector_status anx7625_sink_detect(struct anx7625_data *ctx)
{
struct device *dev = &ctx->client->dev;

- DRM_DEV_DEBUG_DRIVER(dev, "sink detect, return connected\n");
+ DRM_DEV_DEBUG_DRIVER(dev, "sink detect\n");
+
+ if (ctx->pdata.panel_bridge)
+ return connector_status_connected;

- return connector_status_connected;
+ return ctx->hpd_status ? connector_status_connected :
+ connector_status_disconnected;
}

static int anx7625_attach_dsi(struct anx7625_data *ctx)
@@ -1330,7 +1446,7 @@ static int anx7625_attach_dsi(struct anx7625_data *ctx)
return -EINVAL;
}

- dsi->lanes = 4;
+ dsi->lanes = ctx->pdata.mipi_lanes;
dsi->format = MIPI_DSI_FMT_RGB888;
dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
@@ -1376,10 +1492,12 @@ static int anx7625_bridge_attach(struct drm_bridge *bridge,
return -ENODEV;
}

- err = anx7625_attach_dsi(ctx);
- if (err) {
- DRM_DEV_ERROR(dev, "Fail to attach to dsi : %d\n", err);
- return err;
+ if (!ctx->pdata.is_dpi) {
+ err = anx7625_attach_dsi(ctx);
+ if (err) {
+ DRM_DEV_ERROR(dev, "Fail to attach to dsi : %d\n", err);
+ return err;
+ }
}

if (ctx->pdata.panel_bridge) {
@@ -1478,6 +1596,10 @@ static bool anx7625_bridge_mode_fixup(struct drm_bridge *bridge,

DRM_DEV_DEBUG_DRIVER(dev, "drm mode fixup set\n");

+ /* No need fixup for external monitor */
+ if (!ctx->pdata.panel_bridge)
+ return true;
+
hsync = mode->hsync_end - mode->hsync_start;
hfp = mode->hsync_start - mode->hdisplay;
hbp = mode->htotal - mode->hsync_end;
@@ -1786,8 +1908,13 @@ static int anx7625_i2c_probe(struct i2c_client *client,

platform->bridge.funcs = &anx7625_bridge_funcs;
platform->bridge.of_node = client->dev.of_node;
- platform->bridge.ops = DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_HPD;
- platform->bridge.type = DRM_MODE_CONNECTOR_eDP;
+ platform->bridge.ops = DRM_BRIDGE_OP_EDID;
+ if (!platform->pdata.panel_bridge)
+ platform->bridge.ops |= DRM_BRIDGE_OP_HPD |
+ DRM_BRIDGE_OP_DETECT;
+ platform->bridge.type = platform->pdata.panel_bridge ?
+ DRM_MODE_CONNECTOR_eDP :
+ DRM_MODE_CONNECTOR_DisplayPort;
drm_bridge_add(&platform->bridge);

DRM_DEV_DEBUG_DRIVER(dev, "probe done\n");
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h
index 193ad86c5450..beee95da2155 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.h
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
@@ -141,12 +141,20 @@
#define HORIZONTAL_BACK_PORCH_H 0x22 /* Bit[7:4] are reserved */

/******** END of I2C Address 0x72 *********/
+
+/***************************************************************/
+/* Register definition of device address 0x7a */
+#define DP_TX_SWING_REG_CNT 0x14
+#define DP_TX_LANE0_SWING_REG0 0x00
+#define DP_TX_LANE1_SWING_REG0 0x14
+/******** END of I2C Address 0x7a *********/
+
/***************************************************************/
/* Register definition of device address 0x7e */

#define I2C_ADDR_7E_FLASH_CONTROLLER 0x7E

-#define FLASH_LOAD_STA 0x05
+#define FLASH_LOAD_STA 0x05
#define FLASH_LOAD_STA_CHK BIT(7)

#define XTAL_FRQ_SEL 0x3F
@@ -347,11 +355,19 @@ struct s_edid_data {

/***************** Display End *****************/

+#define MAX_LANES_SUPPORT 4
+
struct anx7625_platform_data {
struct gpio_desc *gpio_p_on;
struct gpio_desc *gpio_reset;
struct drm_bridge *panel_bridge;
int intp_irq;
+ int is_dpi;
+ int mipi_lanes;
+ int dp_lane0_swing_reg_cnt;
+ int lane0_reg_data[DP_TX_SWING_REG_CNT];
+ int dp_lane1_swing_reg_cnt;
+ int lane1_reg_data[DP_TX_SWING_REG_CNT];
u32 low_power_mode;
struct device_node *mipi_host_node;
};
--
2.25.1